Researches and application prospects of nano silicon powder

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What’s Nano silicon?

Nano silicon

The smallest diameter of crystal silicon particles is 5 nanometers. This powder is high in purity and has a small particle size. It also exhibits uniform distribution. This product is tasteless and non-toxic due to its high surface area, low bulk density and high surface activity. This new type of optoelectronic materials, nanosilicon powder, is made with high-power light sources and has a large gap energy.

Nano silicon: Recent Research

(1) You can alter the silicon-rich and annealing conditions to control the size or density of silicon dioxide nanocrystals. A lot of literature suggests that silicon nanocrystals will only form at temperatures above 1000oC. We have found that nanocrystals may appear at temperatures as low as 900oC through experimentation. After annealing at 900oC, the high-resolution electron photo of silicon-rich silicone oxide has a silicon content of 30%. The presence of silicon nanocrystals is evident.

(2) First time observation of the electroluminescence from Au/(Ge/SiO2) superlattice/pSi structure. High resolution electron micrograph of four-period Ge/SiO2 supra lattice. SiO2 is the bright-line with a thickness 2.0 nm. The Ge layer has a thickness 2.4 nm.

(3) By magnetron sputtering, the nano-SiO2/Si/SiO2 single-potential high-potential sandwich structure (NDB) was created on the silicon substrate. For the first time, visible electroluminescence was achieved in the Au/NDB/pSi structure. We find that electroluminescence’s peak position and intensity oscillate synchronously with changes in the Nanosilicon layer thickness (W). Analyses and further experiments have confirmed that the oscillation time is 1/2 the de Broglie wavelength. This is explained by an electroluminescence theory that our group has proposed.

(4) Er electroluminescence (with a wavelength 1.54 mm) was first realized using the SiO2 SI:Er film grown through magnetron spraying.

(5) The first report on ultraviolet-based, silicon-based ultraviolet luminescence using heat-treated ITO/natural silicone oxide/pSi showed that it had a low threshold of 360nm.

Applications of nano silicon

The photoluminescence of the main wavelengths (including 1.62mm to 1.54mm) and photoluminescence under low threshold voltage electroluminescence have been realized. There are more than ten types of silicon/siliconoxid nanostructures that we designed on the silicon substrate. It is of great scientific and practical importance.


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